单项选择题

A．Environment.
B．Genes.
C．Parents.
D．Both A and B
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单项选择题
According to the passage, people ______.
A．can not work better in a noisy situation
B．will suffer from complete deafness because of noise pollution
C．can be psychologically affected by working in very noisy factories
D．may cooperate well in noisy surrounding
单项选择题
We can conclude from the passage that we need to control noise pollution if ______.
A．we want to stay both psychologically and physically healthy
B．we don' t want to be physically destroyed
C．we want to cooperate well
D．we don' t want to be anxious
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